U.S. patent number 4,436,467 [Application Number 06/285,855] was granted by the patent office on 1984-03-13 for easily releasable blind rivets.
Invention is credited to Bengt U. I. Andersson, Sven B. Larsson.
United States Patent |
4,436,467 |
Larsson , et al. |
March 13, 1984 |
Easily releasable blind rivets
Abstract
A removable blind rivet comprising a tube (1) with a head (3 or
6) on one end to contact one workpiece (11) of two workpieces (10
and 11) to be rivetted together, the other end (14) being upsetable
against the other workpiece (10) by a pull pin (5) with a head (4)
pulled into the tube, or by blasting an explosive charge (8)
inserted in the other end (14) of the tube. The head is a removable
nut (3) threaded upon the accessible end of the tube (1), or a
spring washer (6) inserted in a slot (7) in the accessible end of
the tube.
Inventors: |
Larsson; Sven B. (S-461 62
Trollhattan, SE), Andersson; Bengt U. I. (S-460 20
Sjuntorp, SE) |
Family
ID: |
20341469 |
Appl.
No.: |
06/285,855 |
Filed: |
July 22, 1981 |
Foreign Application Priority Data
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Jul 23, 1980 [SE] |
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8005318 |
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Current U.S.
Class: |
411/34; 411/107;
411/541; 411/81 |
Current CPC
Class: |
F16B
19/04 (20130101); F16B 19/125 (20130101); F16B
19/1054 (20130101); F16B 33/002 (20130101) |
Current International
Class: |
F16B
19/10 (20060101); F16B 19/04 (20060101); F16B
19/12 (20060101); F16B 33/00 (20060101); F16B
013/04 () |
Field of
Search: |
;411/34,43,44,57,82,103,107,410,411,901-908 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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644125 |
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Oct 1928 |
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FR |
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467411 |
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Feb 1969 |
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CH |
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579462 |
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Nov 1977 |
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SU |
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Primary Examiner: Shedd; Wayne L.
Attorney, Agent or Firm: Holman & Stern
Claims
We claim:
1. A blind rivet comprising a tubular member insertable through
aligned holes in workpieces to be rivetted together from an outer
accessible side to an inner non-accessible side, an enlarged
separate retainer on one end of said tubular member having a
cross-section larger than said holes on the outer side of the
workpieces, said one end to be installed at said outer side, an
expanding pin extending coaxially through said tubular member, an
enlarged head on the inner end of said pin having a cross-section
larger in size than the bore through said tubular member, but
smaller than the hole in the workpiece on the inner side, a tapered
expanding surface on said enlarged head of said pin on the side of
said head adjacent said inner side of said tubular member so that
when said expanding pin is drawn through said tubular member a
limited distance said inner end of the tubular member is expanded
radially outwardly to a cross-sectional size larger than the hole
in the workpiece on the inner side, said retainer being removable
from said tubular member so that said rivet may be removed from the
workpieces without damaging them.
2. The blind rivet as claimed in claim 1 wherein the outer end of
said tubular member is screw-threaded and said retainer comprises
an internally threaded nut engaging said screw-threaded end.
3. The blind rivet as claimed in claim 2 and further comprising a
non-rotating means associated with said tubular member to prevent
rotation of said tubular member in the holes of the workpieces
after the rivet has been installed.
4. The blind rivet as claimed in claim 1 wherein said removable
retainer comprises a substantially U-shaped spring washer and a
peripheral slot in the outer end of said tubular member to receive
said washer, said washer being shaped to be retained in said slot
by the spring action of the washer.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to blind rivets to be used where a side of
one of two work pieces to be rivetted together is
nonaccessible.
2. Description of the Prior Art
For this purpose blind rivets have been used consisting of a tube
to be inserted through holes in the work pieces, one end of said
tube having a head to contact the external surface of one work
piece and the other end having a device, for instance a pull pin
with a head, or a blasting charge, to upset the other end of the
rivet against the surface of the other work piece. Said pull pin
together with its head can partly be pulled into the tube by a
special tool to upset the end of the tube.
BRIEF SUMMARY OF THE INVENTION
One object of the invention is to provide a device making possible
a simple removal of the finished rivet joint and to this end and
according to the invention the head is made removable.
DESCRIPTION OF THE DRAWINGS
The invention, the characteristics of which will be evident from
following claims, will be described more in detail below with
reference to the attached drawings, wherein:
FIGS. 1, 2 and 3 are elevational showing partly sectional each its
own embodiment of a blind rivet according to the invention;
FIG. 4 is an elevational view of an expanding pull pin which is a
part of the blind rivets according to FIGS. 1 and 2;
FIG. 5 is an elevational view of a spring washer used with the
rivet embodiment according to FIG. 2;
FIGS. 6 and 7 are cross-sectional views showing the method used
when rivetting together two work pieces by the rivet embodiment
according to FIG. 1;
FIG. 8 is a plan view of a workpiece which illustrates that a hole
for the blind rivet can be given an irregular non-circular cross
section in at least the lower work piece according to FIGS. 6 and
7;
FIG. 9 is a perspective view showing a blind rivet according to the
embodiment of FIG. 2 having a spring washer of an alternative
design; and
FIG. 10 is a perspective view showing the blind rivet according to
FIG. 9 installed for riveting together two work pieces.
DETAILED DESCRIPTION
The blind rivet as shown in FIG. 1 consists of a tube 1, having its
right end provided with threads 2, upon which a nut 3 is screwn to
work as a head of the rivet. A pull pin 5 longer than the tube is
inserted into the tube, so that a head 4 of the pin contacts the
left end of the tube and the pull pin partly projects out from the
right end of the tube. FIG. 4 shows the entire pull pin.
In the embodiment according to FIG 2, a U-shaped spring retainer
washer 6 is substituted for the nut 3 and is squeezed upon a lot 7
in the tube 1 near its right end. FIG. 5 is a view of a spring
washer to be used for this purpose which will be known to those
skilled in the art.
In the embodiment of the blind rivet shown in FIG. 3 a blasting
charge 8 replaces the pull pin.
As will be seen in FIG. 6, in the embodiment of FIG. 1, the free
portion of the tube 1 is inserted through holes 9 in the work
pieces 10 and 11 to be rivetted together. If the upper work piece
11 should be of a weaker material such as plastic it can be more
advantageously to thread a washer 12 onto the rivet between the
rivets head 3 and the work piece 11. Shown in broken lines is a
pulling tool 13 which is threaded upon the end of the pull pin
protruding above the tube, by means of which one pulls the pull pin
a limited distance through the tube so that the head 7 of the pin
upsets the end 14 of the tube, as will be evident from FIG. 7. Now
one breaks or cuts off the portion 15 of the pull pin protruding
above the tube and the rivet joint is finished.
If thereafter for any reason the rivet joint is to be dismounted,
one only has to remove the accessible head of the rivet, in this
case by unscrewing the nut 3 from the tube 1 of the blind rivet,
after which the upper work piece 11 can be lifted off. After
threading the work piece 11 or another work piece upon the tube 1
of the blind rivet the rivet joint can be restored by rescrewing
the nut 3 upon the tube 1.
If the hole 9 of at least the bottom work piece 10 has been given
an irregular or non-circular cross section, for instance such as
the shape shown in FIG. 8, portions of the tube 1 will file up the
unevennesses of the hole when upsetting the end 14 of the tube and
the blind rivet will be better held and prevented from turning when
unscrewing or screwing up the nut 3.
When using a blind rivet of the type shown in the embodiment of
FIG. 2, one has to remove the spring retainer washer 6 from slot 7
by means of a tool suitable for this purpose in order to remove the
rivet joint.
Another embodiment of a spring retainer washer 6 illustrates in
FIG. 9 which shows a washer 6' having a slot 16 extending from one
edge of the washer and by which the washer is inserted into slot 7
of the blind rivet 1. The other upwardly bent edge 17 functions as
a support for a chisel type tool for knocking away the spring
washer by a hammer for example for removing the blind rivet and the
rivet joint.
When using a blind rivet of the embodiment shown in FIG. 3 an upset
of the end 14 of the tube 1 will be attained by detonating a charge
8 of blasting powder, for example by heating the blind rivet by
means of a soldering iron.
* * * * *